/*获取网址参数*/
getURL(name){
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
    var r = decodeURI(window.location.search).substr(1).match(reg);
    if(r!=null) return  r[2]; return null;
}

/*获取全部url参数,并转换成json对象*/
getUrlAllParams (url) {
    var url = url ? url : window.location.href;
    var _pa = url.substring(url.indexOf('?') + 1),
        _arrS = _pa.split('&'),
        _rs = {};
    for (var i = 0, _len = _arrS.length; i < _len; i++) {
        var pos = _arrS[i].indexOf('=');
        if (pos == -1) {
            continue;
        }
        var name = _arrS[i].substring(0, pos),
            value = window.decodeURIComponent(_arrS[i].substring(pos + 1));
        _rs[name] = value;
    }
    return _rs;
}

/*删除url指定参数，返回url*/
delParamsUrl(url, name){
    var baseUrl = url.split('?')[0] + '?';
    var query = url.split('?')[1];
    if (query.indexOf(name)>-1) {
        var obj = {}
        var arr = query.split("&");
        for (var i = 0; i < arr.length; i++) {
            arr[i] = arr[i].split("=");
            obj[arr[i][0]] = arr[i][1];
        };
        delete obj[name];
        var url = baseUrl + JSON.stringify(obj).replace(/[\"\{\}]/g,"").replace(/\:/g,"=").replace(/\,/g,"&");
        return url
    }else{
        return url;
    }
}

/*获取十六进制随机颜色*/
getRandomColor () {
    return '#' + (function(h) {
        return new Array(7 - h.length).join("0") + h;
    })((Math.random() * 0x1000000 << 0).toString(16));
}

/*图片加载*/
imgLoadAll(arr,callback){
    var arrImg = []; 
    for (var i = 0; i < arr.length; i++) {
        var img = new Image();
        img.src = arr[i];
        img.onload = function(){
            arrImg.push(this);
            if (arrImg.length == arr.length) {
                callback && callback();
            }
        }
    }
}

/*音频加载*/
loadAudio(src, callback) {
    var audio = new Audio(src);
    audio.onloadedmetadata = callback;
    audio.src = src;
}

/*DOM转字符串*/
domToStirng(htmlDOM){
    var div= document.createElement("div");
    div.appendChild(htmlDOM);
    return div.innerHTML
}

/*字符串转DOM*/
stringToDom(htmlString){
    var div= document.createElement("div");
    div.innerHTML=htmlString;
    return div.children[0];
}


/**
 * 光标所在位置插入字符，并设置光标位置
 * 
 * @param {dom} 输入框
 * @param {val} 插入的值
 * @param {posLen} 光标位置处在 插入的值的哪个位置
 */
setCursorPosition (dom,val,posLen) {
    var cursorPosition = 0;
    if(dom.selectionStart){
        cursorPosition = dom.selectionStart;
    }
    this.insertAtCursor(dom,val);
    dom.focus();
    console.log(posLen)
    dom.setSelectionRange(dom.value.length,cursorPosition + (posLen || val.length));
}

/*光标所在位置插入字符*/
insertAtCursor(dom, val) {
    if (document.selection){
        dom.focus();
        sel = document.selection.createRange();
        sel.text = val;
        sel.select();
    }else if (dom.selectionStart || dom.selectionStart == '0'){
        let startPos = dom.selectionStart;
        let endPos = dom.selectionEnd;
        let restoreTop = dom.scrollTop;
        dom.value = dom.value.substring(0, startPos) + val + dom.value.substring(endPos, dom.value.length);
        if (restoreTop > 0){
            dom.scrollTop = restoreTop;
        }
        dom.focus();
        dom.selectionStart = startPos + val.length;
        dom.selectionEnd = startPos + val.length;
    } else {
        dom.value += val;
        dom.focus();
    }
}